Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A sprinter runs a short race. Near the end, breathing becomes very fast and leg muscles ache. After resting, the ache reduces.
Total: 4 marks
(a) Why does breathing become faster? (1 mark)
(b) Name the substance linked with muscle ache. (1 mark)
(c) Explain why resting helps reduce the ache. (2 marks)
Something wrong with this item?